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Lab 32.1 issue with diff

albiurs
albiurs Posts: 51
in LFS207 Class Forum

Hi,

In the lab 32.1, diff claims that the directory doesn't exist with some python related message. However it actually exists:

┌──(alu@nb)-[/tmp]
└─$ ls restore/
include

┌──(alu@nb)-[~]
└─$ diff -r /tmp/restore/include/ /usr/include/
diff: /tmp/restore/include/python3.11/numpy: No such file or directory

I tried the diff command with two test dirs without an issue:

┌──(alu@nb)-[/tmp]
└─$ ls test1 test2
test1:
sub1  test.txt

test2:
test.txt

┌──(alu@nb)-[/tmp]
└─$ diff -r /tmp/test1 /tmp/test2
Only in /tmp/test1: sub1
diff '--color=auto' -r /tmp/test1/test.txt /tmp/test2/test.txt
1d0
< xxx

So, the diff command as such works as expected.

Where does this issue come from?

Thanks,
Urs

Answers

  • luisviveropena
    luisviveropena Posts: 1,285

    Hi Urs,

    I checked on the labs file and Lab 32.1 is about another thing. Are you sure about the chapter and section?

    Regards,
    Luis.

  • albiurs
    albiurs Posts: 51

    Hi Luis,

    Yes, it's about backup and restore with tar. At the very end of Lab 32.1, step 4:
    "4. Compare the contents with the original directory the archive was made from."

    diff is used to compare the contents of the original /usr/includes directory, with the restored one. The solution suggests:
    $ diff -qr include /usr/include

    Regards,
    Urs

  • albiurs
    albiurs Posts: 51

    @albiurs said:
    Hi Luis,

    Yes, it's about backup and restore with tar. At the very end of Lab 32.1, step 4:
    "4. Compare the contents with the original directory the archive was made from."

    diff is used to compare the contents of the original /usr/includes directory, with the restored one. The solution suggests:
    $ diff -qr include /usr/include

    Regards,
    Urs

    ...This is the Link to the Lab:
    https://trainingportal.linuxfoundation.org/learn/course/linux-system-administration-essentials-lfs207/backup-and-recovery-methods/lab-exercises?page=1

  • luisviveropena
    luisviveropena Posts: 1,285

    Hi Urs,

    I got it. So, I went over Lab 32.1 on Ubuntu 24.04 and it worked fine for me. The diff tool didn't report any issue and the output for the command was empty, as expected:

    ubuntu@master:/tmp/backup/restore/usr$ diff -qr include/ /usr/include/
    ubuntu@master:/tmp/backup/restore/usr$

    Per the man page, the 'q' parameter reports only when files differ. And 'r' is for 'recursive'.

    What OS and version are you using?

    Regards,
    Luis.

  • albiurs
    albiurs Posts: 51
    edited November 2024

    Hi Luis,

    I'm on Debian 12:

    ┌──(alu@nb)-[~]
└─$ cat /etc/os-release 
PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
NAME="Debian GNU/Linux"
VERSION_ID="12"
VERSION="12 (bookworm)"
VERSION_CODENAME=bookworm
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

┌──(alu@nb)-[~]
└─$ uname -a
Linux nb 6.1.0-27-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.115-1 (2024-11-01) x86_64 GNU/Linux

    I just tried it again with the same python error on this system. But now I also tried it on a Ubuntu VM where I don't get this error too. So I think it must be an issue of my Debian machine...

    By the way what means:
    #1 SMP PREEMPT_DYNAMIC Debian 6.1.115-1?

    Thanks,
    Urs

  • luisviveropena
    luisviveropena Posts: 1,285

    Hi Urs,

    I just tried it again with the same python error on this system. But now I also tried it on a Ubuntu VM >where I don't get this error too. So I think it must be an issue of my Debian machine...

    Yep, it seems to be related to that system or that OS/version in particular.

    By the way what means:

    1 SMP PREEMPT_DYNAMIC Debian 6.1.115-1?

    It indicates that the kernel has support for SMP dynamic preemption.

    Regards,
    Luis.

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